In my experience acacia started in wither on the window sill, suffers the lack of fresh air exchange and natural light and very often is developing fungal diseases / moldy soil and mildew onto the stem and leaves , leading to very low survival rate /.
I'm guessing desmanthus requirements are probably similar

Two year old article on ancient trichocereus offering ..
/click on the photos for better view/
https://www.ancient-origins.net/news-history-archaeology/surprising-offering-hallucinogenic-cactus-discovered-prehispanic-temple-020964
Chuquitanta or El Paraíso (The Paradise) are the modern names for a monumental archaeological complex located in the Chillon River valley, several kilometers north of downtown Lima and dated to the Late Archaic Period (3500-1800 BC). More specifically, different radiocarbon dates place the site to between the years 2300 and 1400 BC.
Discovered in 1950 by Louis Stumer, it was Thomas C. Patterson and Edward P. Lanning who, in 1964, managed to identify about nine structures and labelled it as a preceramic site.
A year later, in 1965, Frederic Engel conducted explorations and excavations at the site and identified another 8 buildings scattered over a large area, so he defined the site as a great architectural complex and one of the largest in ancient Peru. Subsequently, following neglect by authorities, the area began to be protected by nearby residents, although this was not enough to avoid destruction and the inevitable disappearance of the huacas.
One of the pyramids of the El Paraíso or Chuquitanta complex. (Dibojutri/ CC BY-SA 3.0 )
It was precisely because of the insistence of these people that the state finally became interested in the site. The first public investment project began on December 24, 2012. The site was excavated in five sectors and the archaeologists found that the complex was composed of twelve pyramids in total, which were spread over a large area.
On January 15, 2013 archaeologists discovered an architectural structure they called the Temple of Fire, which has similarities to buildings found in Caral and Kotosh (contemporary structures.) They now called the site the oldest architectural complex of the Lima coast and the first settlement where nomadic societies became sedentary through agriculture, 4,000 years ago.
Now, experts know that the diet of the inhabitants consisted of a mixture of domesticated and gathered resources, in which wild plants could have represented a substantial part. But the cultivated plants supplemented the diet of the ancient people too. Some of the plants consumed in this period were amaranth, potato, pumpkin, carob, cotton, and cactus. And it is a cactus that is at least 4,000 years old which has now surprised Peruvian archaeologists after being discovered among Lima’s oldest prehistoric temples.
As RPP Noticias reports, the cactus - possibly an example odf the hallucinogenic species San Pedro (Echinopsis pachanoi) measures about 30 centimeters in length. It is in perfect condition and even still has some spikes, as it was dehydrated before being buried as part of an offering.
Archaeologist Dayanna Carbonel, who discovered the plant, explained that she had never encountered such an old cactus in an archaeological dig, “and even less as a central part of an offering” - which reveals its importance. Meanwhile, Santiago Morales, curator of the area, has said that the cactus “could have been used in ceremonies and rituals” because it was found in an annex to a ceremonial room.
Peruvian Prehispanic structures in the archaeological complex of El Paraíso ( RPP Noticias / EFE )
In addition, the cactus is also important for researchers because they have not found remains of pottery nearby (except for in later sites), forcing archaeologists to focus their research on the waste left by human activity to find out more on the way of life of the site’s inhabitants.
In addition to the plant, the researchers have recovered other relevant objects in the same area. For example, they have found a sling constructed with plant material and a club or mace formed by a stick piercing a stone and tied to it with a rope - which could suggest some kind of combat in the area.
Image of the club or mace found in the same area as the cactus. ( RPP News/EFE )
Finally, Morales noted that the archaeological complex has a dozen buildings in an area covering about sixty hectares, and so far, only four of them been excavated in part. So, there is still 95% of the site to be researched, which will surely reveal new and fascinating discoveries in the future.
Top image: The recently discovered cactus, possibly belonging to the hallucinogenic species San Pedro (Echinopsis pachanoi).

A personal choice really..
I myself prefer clearing spines / pruning / before wintering indoors, for purposes of safety and convenience.
Stability should be achieved by proper root development in the pot. If you're repotting a long cactus, there need to be an adequate support provided /sticks,bars/ alongside in the pot, untill the roots are well established. There need to be enough heavy ingredients in the pot /rocks,sand/ to make it a stable base for the future development of the column too.

I've dicided to give this particular monstrose growing 'sharxx blue x tpm' hybrid a name, for I'm about to release some cloned cuttings and grafts soon ..There'll be other monstrose hybrids with same parentage and it's a way to distinguish, naming ..
A great big THANK YOU to @nitrogen for the amzing personality he is and his visionary approach hybridizing these plants!
So.. without further ado.. intoducing "Clime"..
I'll add more photos as this plant developes further.
It's very blue obviously, short spines, peruvian look.. when normal
It's a keeper and It'll be very interesting to see pictures from outdoor plants .
cheers
B.